Re: oops in futex_init()

[Ralf Baechle <ralf@linux-mips.org>]

On Thu, Apr 30, 2009 at 12:41:30PM +0200, Manuel Lauss wrote:

> This is really embarrassing:  The oops is what happens when you
> ioremap(0x10) and write 0xffffffff at the resulting address (0xa0000010).

That address is the TLB reload handler.  You just overwrote the TLB
exception hander.  0xffffffff is sd $31, -1($31) which is a MIPS III
that is 64-bit instruction which the Alchemy core duly honors with a
reserved instruction exception.  The handler is running with
c0_status.exl=1 so the EPC will point to the LL instruction but the
exception printed in the panic will be the 2nd exception.  Case closed,
I'd say.

  Ralf